Finding the Third Proportional to 431,978 and 891,558

Step by Step Solution

1. Step 1: Write the proportion equation
   431,978 : 891,558 = 891,558 : x
2. Step 2: Convert to fraction form
   431,978/891,558 = 891,558/x
3. Step 3: Cross multiply
   431,978x = 891,558 × 891,558
4. Step 4: Simplify right side
   431,978x = 794,875,667,364
5. Step 5: Solve for x
   x = 794,875,667,364/431,978
6. Step 6: Final answer
   x = 1,840,083.68